Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0776 and P0777 are Type A DTCs. Refer to Diagnostic Trouble Code (DTC) Type Definitions and Diagnostic Trouble Code (DTC) List/Type .
The TCM commands maximum line pressure.
The TCM inhibits TCC.
The TCM freezes transmission adaptive functions.